Flexible transparent electrodes are widely used in flexible displays, optoelectronic devices, flexible heating/electromagnetic shielding devices, and flexible sensors. However, significant challenges remain to obtain stable service under harsh environments, owing to the limitations of flexible transparent substrates and conductive materials. Herein, a simple and cost‐effective fabrication approach for harsh‐environment flexible transparent electrodes (HFTEs) is demonstrated via the electric field‐driven microscale 3D printing of a silver mesh on a colorless polyimide (CPI) substrate. Vertical jet orientation on the CPI substrate is realized by controlling the printing parameters, which effectively reduce the instability of the cone jet and is conducive to the preparation of the high‐precision silver mesh on the CPI substrate. The HFTE exhibits good optoelectronic properties (resistance of 4.82 Ω sq−1 and transmittance of 92.26%), and excellent extreme environmental stability with a negligible increase in sheet resistance under various cyclic tests (200 000 bending cycles, 100 adhesion tests, high temperature heating capacity of 360 °C, 80 h of chemical attack, and 120 days of atmospheric environment attack). Baking of quail eggs and deicing experiments are also conducted, which successfully demonstrate the practical viability of the HFTE. Thus, the proposed technique offers a simple and efficient solution for the manufacturing of HFTEs.
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